I get an errore message:
ERRORE: 'Premature end of file.'
20-lug-2009 13.37.07 com.sun.xml.internal.messaging.saaj.soap.EnvelopeF actory createEnvelope
GRAVE: SAAJ0511: Unable to create envelope from given source

And if I print the InputStream of the request on the server I get:
------=_Part_0_56667.1248089818390
Content-Type: text/xml; charset=utf-8